[deliverable/linux.git] / arch / mips / lasat / interrupt.c

/*
 * Carsten Langgaard, carstenl@mips.com
 * Copyright (C) 1999,2000 MIPS Technologies, Inc.  All rights reserved.
 *
 *  This program is free software; you can distribute it and/or modify it
 *  under the terms of the GNU General Public License (Version 2) as
 *  published by the Free Software Foundation.
 *
 *  This program is distributed in the hope it will be useful, but WITHOUT
 *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 *  for more details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
 *
 * Routines for generic manipulation of the interrupts found on the
 * Lasat boards.
 */
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/kernel_stat.h>

#include <asm/bootinfo.h>
#include <asm/irq.h>
#include <asm/lasat/lasatint.h>
#include <asm/gdb-stub.h>

static volatile int *lasat_int_status = NULL;
static volatile int *lasat_int_mask = NULL;
static volatile int lasat_int_mask_shift;

extern asmlinkage void lasatIRQ(void);

void disable_lasat_irq(unsigned int irq_nr)
{
	unsigned long flags;

	local_irq_save(flags);
	*lasat_int_mask &= ~(1 << irq_nr) << lasat_int_mask_shift;
	local_irq_restore(flags);
}

void enable_lasat_irq(unsigned int irq_nr)
{
	unsigned long flags;

	local_irq_save(flags);
	*lasat_int_mask |= (1 << irq_nr) << lasat_int_mask_shift;
	local_irq_restore(flags);
}

static unsigned int startup_lasat_irq(unsigned int irq)
{
	enable_lasat_irq(irq);

	return 0; /* never anything pending */
}

#define shutdown_lasat_irq	disable_lasat_irq

#define mask_and_ack_lasat_irq disable_lasat_irq

static void end_lasat_irq(unsigned int irq)
{
	if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
		enable_lasat_irq(irq);
}

static struct hw_interrupt_type lasat_irq_type = {
	.typename = "Lasat",
	.startup = startup_lasat_irq,
	.shutdown = shutdown_lasat_irq,
	.enable = enable_lasat_irq,
	.disable = disable_lasat_irq,
	.ack = mask_and_ack_lasat_irq,
	.end = end_lasat_irq,
};

static inline int ls1bit32(unsigned int x)
{
	int b = 31, s;

	s = 16; if (x << 16 == 0) s = 0; b -= s; x <<= s;
	s =  8; if (x <<  8 == 0) s = 0; b -= s; x <<= s;
	s =  4; if (x <<  4 == 0) s = 0; b -= s; x <<= s;
	s =  2; if (x <<  2 == 0) s = 0; b -= s; x <<= s;
	s =  1; if (x <<  1 == 0) s = 0; b -= s;

	return b;
}

static unsigned long (* get_int_status)(void);

static unsigned long get_int_status_100(void)
{
	return *lasat_int_status & *lasat_int_mask;
}

static unsigned long get_int_status_200(void)
{
	unsigned long int_status;

	int_status = *lasat_int_status;
	int_status &= (int_status >> LASATINT_MASK_SHIFT_200) & 0xffff;
	return int_status;
}

void lasat_hw0_irqdispatch(struct pt_regs *regs)
{
	unsigned long int_status;
	int irq;

	int_status = get_int_status();

	/* if int_status == 0, then the interrupt has already been cleared */
	if (int_status) {
		irq = ls1bit32(int_status);

		do_IRQ(irq, regs);
	}
}

void __init arch_init_irq(void)
{
	int i;

	switch (mips_machtype) {
	case MACH_LASAT_100:
		lasat_int_status = (void *)LASAT_INT_STATUS_REG_100;
		lasat_int_mask = (void *)LASAT_INT_MASK_REG_100;
		lasat_int_mask_shift = LASATINT_MASK_SHIFT_100;
		get_int_status = get_int_status_100;
		*lasat_int_mask = 0;
		break;
	case MACH_LASAT_200:
		lasat_int_status = (void *)LASAT_INT_STATUS_REG_200;
		lasat_int_mask = (void *)LASAT_INT_MASK_REG_200;
		lasat_int_mask_shift = LASATINT_MASK_SHIFT_200;
		get_int_status = get_int_status_200;
		*lasat_int_mask &= 0xffff;
		break;
	default:
		panic("arch_init_irq: mips_machtype incorrect");
	}

	/* Now safe to set the exception vector. */
	set_except_vector(0, lasatIRQ);

	for (i = 0; i <= LASATINT_END; i++) {
		irq_desc[i].status	= IRQ_DISABLED;
		irq_desc[i].action	= 0;
		irq_desc[i].depth	= 1;
		irq_desc[i].handler	= &lasat_irq_type;
	}
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Carsten Langgaard, carstenl@mips.com
	3	* Copyright (C) 1999,2000 MIPS Technologies, Inc. All rights reserved.
	4	*
	5	* This program is free software; you can distribute it and/or modify it
	6	* under the terms of the GNU General Public License (Version 2) as
	7	* published by the Free Software Foundation.
	8	*
	9	* This program is distributed in the hope it will be useful, but WITHOUT
	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	12	* for more details.
	13	*
	14	* You should have received a copy of the GNU General Public License along
	15	* with this program; if not, write to the Free Software Foundation, Inc.,
	16	* 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
	17	*
42a3b4f2	18	* Routines for generic manipulation of the interrupts found on the
1da177e4 LT	19	* Lasat boards.
	20	*/
	21	#include <linux/init.h>
	22	#include <linux/sched.h>
	23	#include <linux/slab.h>
	24	#include <linux/interrupt.h>
	25	#include <linux/kernel_stat.h>
	26
	27	#include <asm/bootinfo.h>
	28	#include <asm/irq.h>
	29	#include <asm/lasat/lasatint.h>
	30	#include <asm/gdb-stub.h>
	31
	32	static volatile int *lasat_int_status = NULL;
	33	static volatile int *lasat_int_mask = NULL;
	34	static volatile int lasat_int_mask_shift;
	35
	36	extern asmlinkage void lasatIRQ(void);
	37
	38	void disable_lasat_irq(unsigned int irq_nr)
	39	{
	40	unsigned long flags;
	41
	42	local_irq_save(flags);
	43	*lasat_int_mask &= ~(1 << irq_nr) << lasat_int_mask_shift;
	44	local_irq_restore(flags);
	45	}
	46
	47	void enable_lasat_irq(unsigned int irq_nr)
	48	{
	49	unsigned long flags;
	50
	51	local_irq_save(flags);
	52	*lasat_int_mask \|= (1 << irq_nr) << lasat_int_mask_shift;
	53	local_irq_restore(flags);
	54	}
	55
	56	static unsigned int startup_lasat_irq(unsigned int irq)
	57	{
	58	enable_lasat_irq(irq);
	59
	60	return 0; /* never anything pending */
	61	}
	62
	63	#define shutdown_lasat_irq disable_lasat_irq
	64
	65	#define mask_and_ack_lasat_irq disable_lasat_irq
	66
	67	static void end_lasat_irq(unsigned int irq)
	68	{
	69	if (!(irq_desc[irq].status & (IRQ_DISABLED\|IRQ_INPROGRESS)))
	70	enable_lasat_irq(irq);
	71	}
	72
	73	static struct hw_interrupt_type lasat_irq_type = {
8ab00b9a RB	74	.typename = "Lasat",
	75	.startup = startup_lasat_irq,
	76	.shutdown = shutdown_lasat_irq,
	77	.enable = enable_lasat_irq,
	78	.disable = disable_lasat_irq,
	79	.ack = mask_and_ack_lasat_irq,
	80	.end = end_lasat_irq,
1da177e4 LT	81	};
	82
	83	static inline int ls1bit32(unsigned int x)
	84	{
	85	int b = 31, s;
	86
	87	s = 16; if (x << 16 == 0) s = 0; b -= s; x <<= s;
	88	s = 8; if (x << 8 == 0) s = 0; b -= s; x <<= s;
	89	s = 4; if (x << 4 == 0) s = 0; b -= s; x <<= s;
	90	s = 2; if (x << 2 == 0) s = 0; b -= s; x <<= s;
	91	s = 1; if (x << 1 == 0) s = 0; b -= s;
	92
	93	return b;
	94	}
	95
	96	static unsigned long (* get_int_status)(void);
	97
	98	static unsigned long get_int_status_100(void)
	99	{
	100	return lasat_int_status & lasat_int_mask;
	101	}
	102
42a3b4f2	103	static unsigned long get_int_status_200(void)
1da177e4 LT	104	{
	105	unsigned long int_status;
	106
	107	int_status = *lasat_int_status;
	108	int_status &= (int_status >> LASATINT_MASK_SHIFT_200) & 0xffff;
	109	return int_status;
	110	}
	111
	112	void lasat_hw0_irqdispatch(struct pt_regs *regs)
	113	{
	114	unsigned long int_status;
	115	int irq;
	116
	117	int_status = get_int_status();
	118
	119	/* if int_status == 0, then the interrupt has already been cleared */
	120	if (int_status) {
	121	irq = ls1bit32(int_status);
	122
	123	do_IRQ(irq, regs);
	124	}
	125	}
	126
	127	void __init arch_init_irq(void)
	128	{
	129	int i;
	130
	131	switch (mips_machtype) {
	132	case MACH_LASAT_100:
	133	lasat_int_status = (void *)LASAT_INT_STATUS_REG_100;
	134	lasat_int_mask = (void *)LASAT_INT_MASK_REG_100;
	135	lasat_int_mask_shift = LASATINT_MASK_SHIFT_100;
	136	get_int_status = get_int_status_100;
	137	*lasat_int_mask = 0;
	138	break;
	139	case MACH_LASAT_200:
	140	lasat_int_status = (void *)LASAT_INT_STATUS_REG_200;
	141	lasat_int_mask = (void *)LASAT_INT_MASK_REG_200;
	142	lasat_int_mask_shift = LASATINT_MASK_SHIFT_200;
	143	get_int_status = get_int_status_200;
	144	*lasat_int_mask &= 0xffff;
	145	break;
	146	default:
	147	panic("arch_init_irq: mips_machtype incorrect");
	148	}
	149
	150	/* Now safe to set the exception vector. */
	151	set_except_vector(0, lasatIRQ);
	152
	153	for (i = 0; i <= LASATINT_END; i++) {
	154	irq_desc[i].status = IRQ_DISABLED;
	155	irq_desc[i].action = 0;
	156	irq_desc[i].depth = 1;
	157	irq_desc[i].handler = &lasat_irq_type;
	158	}
	159	}